Howtosignalprocessing
- What is minimum shift keying technique?
- How does GMSK modulation work?
- What is the difference between GMSK and GFSK?
- How does GFSK work?
What is minimum shift keying technique?
The minimum-shift keying (MSK) scheme is used in GSM, a pioneer and a widely-used digital cellular mobile system. MSK can be viewed as either a special case of binary continuous-phase frequency-shift keying (CPFSK) or a special case of OQPSK.
How does GMSK modulation work?
The Gaussian Minimum Shift Keying (GMSK) modulation is a modified version of the Minimum Shift Keying (MSK) modulation where the phase is further filtered through a Gaussian filter to smooth the transitions from one point to the next in the constellation.
What is the difference between GMSK and GFSK?
With GMSK, the frequency modulation index is 0.5. With GFSK, the frequency modulation index is larger than 0.5 (the signaling tones are farther apart). The receiving techniques used for GMSK as an FSK work for GFSK.
How does GFSK work?
Gaussian frequency-shift keying (GFSK) is a type of FSK modulation which uses a Gaussian filter to shape the pulses before they are modulated. This reduces the spectral bandwidth and out-of-band spectrum, to meet adjacent-channel power rejection requirements.
